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The Earth’s mantle is about 2,970 km thick, making up about 84% of the Earth’s total volume. You might think it’s a liquid, since volcanoes erupt lava from the mantle. But actually, the mantle is mostly solid rock. Magma is liquid rock that seeps out of the mantle and collects into pockets beneath the crust called magma chambers.
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Mantle contains molten rocks.
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